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1. (WO2017181946) METHOD FOR CONTROLLING ZERO SEQUENCE VOLTAGE OF VOLTAGE SOURCE CONVERTER

Pub. No.:    WO/2017/181946    International Application No.:    PCT/CN2017/080998
Publication Date: Fri Oct 27 01:59:59 CEST 2017 International Filing Date: Thu Apr 20 01:59:59 CEST 2017
IPC: H02J 3/36
Applicants: NR ELECTRIC CO., LTD
南京南瑞继保电气有限公司
NR ENGINEERING CO., LTD
南京南瑞继保工程技术有限公司
Inventors: WANG, Ke
王柯
LI, Gang
李钢
LU, Yu
卢宇
DONG, Yunlong
董云龙
LU, Jiang
鲁江
HU, Zhaoqing
胡兆庆
JIANG, Tiangui
姜田贵
Title: METHOD FOR CONTROLLING ZERO SEQUENCE VOLTAGE OF VOLTAGE SOURCE CONVERTER
Abstract:
Provided is a method for controlling a zero sequence voltage of a voltage source converter. When an alternating current system ground fault occurs, a zero sequence voltage at an alternating current (AC) side or a zero sequence voltage at a direct current (DC) side of a converter is detected. If the detected zero sequence voltage is greater than a set value V0ref, a DC side voltage of the converter can be increased to a set value Udc0, thereby generating an appropriate reference wave at the AC side of the converter to match an AC voltage, and accordingly controlling overmodulation of a reference wave at a faulty station to suppress fluctuation of a DC voltage.